22? ??? ????? ??????? CIA(Computer Industry Almanac)? ??? 1990?? 99??? 50??? ??? ???? ??? ?? ??? ?? ??? ??? ???? 568?8000??? ?? 10???.

1?? ???? 1?1082?5000????. ?? ??? ??? ??? 2?5900??? 43%? 2?? ??(1815?6000?)?? ???? ??. 3?? ???? 1397?5000??? ????. ? ??? ???(1327?7000?), ??(1228?5000?), ??(683?7000?), ???(679??), ??(630?8000?), ???(569?6000?) ???. 11～15??? ??(479??), ????(474?5000?), ???(395??), ????(293?3000?), ???(290?5000?) ?? ??? ???. CIA? ??? ??? ???? 2002?? ?? 1000?? 79.4? ?? 4?9000????,2005??? 7?6500??(?? 1000?? 118?)?? ??? ??? ????.